The connection components (8,9) provide a stable connection between the carrier and the housing in at least two predetermined different orientations. Each of the components has at least two convex locating surfaces (82,92) and one which is concave, all such surfaces having corresp. curvature radii, their movement determining the different orientations. The carrier incorporates an electrical energy source, and the connecting components have contacts for transmission of electrical energy from the carrier to a user component in the computer housing. The housing and connecting components have contacts in the area of the locating surfaces for transmission of energy and/or data. The housing and the connecting components incorporate mechanical fixtures (17) which hold them together, the fixtures being manoeuvred by a unit (15) in the housing in connection with sepn. of a connecting component. The presentation unit in the cover is of approx. A4 format, and in the housing is a smaller unit with a capacity for an appropriate number of alpha-bumerical symbols.
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